Pressure-gage



UNITED STATES i Muur onirica.

ERICH EDELMANN, OF CHICAGO, ILLINOIS, ASSIGNOR TO A. SVCHRADERS SON,INC., 0F

NEW YORK, N. Y., A. CORPORATION 0F YORK.

rnEssUnE-GAGE.

Specification of Letters Patent.

Patented Nov. 25, 1919.

To all whom it may concern:

Be it known that I, ERICH' EDELMANN,

citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Pressure-Gages; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the ari; to which it appertains to make and use thesame.

This invention has for its object to provide a novel construction in apressure gage particularly adapted for use to read the pressuresexisting in pneumatic tires, or the like, and consists in the featuresof construction and combinations of parts hereinafter fully describedand claimed.

In the accompanying drawings illustrating the invention: v

Figur -1-- is a View a pressure gage constructed in in side elevation ofaccordance with my invention.

Fig. -2 is a view in elevation of the gage bar employed. v

Fig. -3- is a central vertical longitudinal section of the tire gage onan enlarged scale. f

Fig. 4 is a horizontal section of the same on the'line 4-4'of Fig. 3.

Fi .y -5- is .a detail perspective view showing a plunger employed.

Fig. -6- isla detail sectional View of the piston actuated by the fluidpressure to impart movement to the gage bar in-one direction.

My invention has for its object to provide a small pocket pressure gagew carried in the manner of a pencil or fountain pen and may be appliedto the inflation tube of a pneumatic tire for the purpose of opening acheck valve and admitting the fiuid pressure into said gage to move thegage bar to indicate the pressure, the particular object of the presentinvention being to provide means whereby the gage bar is actuated by theHuid pressure in one direction only and is held frictionally in theposition'to which it has been moved in order to enable the pressure tobe read after removal of thegage from the inflation tube of the tire.

The invention consists more particularly in the combination of detailsof construction for accomplishing the aforesaid object.

hieh may be The device comprises a cylindrical casing -or tube 1l inwhich there is longitudinally movable the piston 2 having a centrallydisposed stem 3, said piston and stem being provided with a -centralthreaded opening to receive the screw 4 by means of which the 'cupwasher' 5 is secured to said piston, the

latter forming a fluid-tight joint within the tube around said piston.Mounted upon the upper end of said tube 1 is a cap 6 having a slot 7 inits head through which the Hat gage bar 8 projects, the latter beinglongitudinallymovable in the casing and being of considerably less widththan the inner diameter of said tube or casing 1. The said cap 6 isprovided at its lower end with an annular vinternally threaded flange 9of greater diameter than said cap 6 and which receives the upper end ofthe tube or casing 1. A washer 10 is interposed between the upper end ofthe tube l and the shoulder at the base of the cap 6, said washer beingalso provided with a slot through which the gage bar 8vpasses. Thelatter is provided at its lower end with a projection 11 to prevent itfrom being withdrawn through the,

slot 7. In the cap 6 the rubber washer or collar12 is disposed whichengages the side edge portions of the gage bar 8 to frictionally supportthe latter at any desired elevation relatively to said tube 1. Thehelical compression spring 13 linterposed between the washer 10 and thepiston 2 serves to hold the latter normally at the lower limit of itsmovement, the said spring also surrounding said gage bar 8 which 4isfreely movable therein. I

' Secured to the lower end portion of said tube or `casing 1 is a.sleeve 14 which is provided interiorly between its ends with an annularflange 15. The said annular flange serves practically to divide saidsleeve 14 in-to two compartments, the .upper vof which communicates withthe tube or casing 1. The said upper end portion of'said sleeve 14 isinteriorly threaded toengage the eX- terior threads on the lower end ofthe tubeV or casing 1. Mounted Vin said l sleeve 14 iS a member lhavinga shank 17 passing through the central opening bordered by said annularila-nge 15, the saidmember 16 bein held in place in the upper endportion of tile sleeve 14 by means of a washer 18 provided with acentral slot 19, said washer being forced into place and engaging thethreads in the upper end portion of said member 14 to hold said member16 firmly down upon the flange 15 and agalnst upward movement relativelyto the member 14.

The saidy member 16 and its shank 17 are provided with a continuousradial slot 20 extending the entire length thereof. Mounted in the lowercompartment or end portion of said sleeve 14 is a rubber gasket 21 whichsurrounds the shank 17 of the member 16 and is preferably of'slightlygreater diameter than the said lower end portion of said member 14 so asto be required to be forced into said member and adapted to remainIirmly secured therein by engagement thereof with the circumferentialwall of` said sleeve 14.

The operation ofthe device is as follows:

The lower end portion of the member 14 is of somewhat greater innerdiameter than the outer diameter of the inflation tube of the tire andis adap-ted to receive the latter. By forcing the vsaid devicedownwardly upon the endof theinlation tube the rubber gasket 21 will becompressed and the shank 17 of the member 16 will be brought to bearupon the stem of the check valve of the tire to open the latter'againstaction of the pressure within the tire. The air thus escaping from thetire will find its Way through the slot 20 in the shank 17 and member 16and through the slot 19 in the washer 18 into the compartment below thepiston 2. The fluid pressure will serve to force said piston upwardlyagainst the action of the spring 13 thus raising the gage bar 8. Theupper end wall ofthe cap 6 registers withv the graduated scale on saidgage bar to indicate the fluid pressure exerted upon the piston 2. Afterhaving applied the device to the inflation tube of the tire for a periodsuiiciently long to enable` the gage bar to be moved upwardly'the devicemay be removed from said inflation tube whereuponthe spring 13 willreturn the piston 2 tothe lower limit of its movement without, however,retracting the gage bar 8 which is frictionally held in vits elevatedposition by the said washer 12 and is not engaged by the spring 13 orconnected with the piston 2. The device may then be held up to the lightfor the purpose of reading the pressure and after the same has been readsaid gage bar may be pushed back with the finger whereupon the device'is ready for another operation.

The device is very simple and efcient. I claim as my invention:

1. In a tire gage, a tubular memberhaving at each end means providing areduced opening one of which is adapted to be connected with a source offluid pressure, a piston member in the tubular member and adapted to belactuated in one direction by the Huid thus supplied, a spring resistingsuch movement of said piston member away from said fluid connected endof the tubular member, a gage member movable through the opening in theother end of said tubular member and having thereon a graduated scaleadapted to register with said end packing means secured againstlongitudina movement in said tubular member and frictionally Vvengagingsaid gage member, thev latter being capable of movement independlentlyof, but adapted to be moved by said piston member when the latter isactuated by fluid pressure, the gage member in its projected positionindicatm such pressure,

and being frictionally held 1n 'such position a slot" in its head andhaving an annular internally threaded flange engaging external threadson said member, a, washer having a slot interposed between the end ofsaid tube and the shoulder at the base of said flange, a gage barpassing through said slots in said washer and said end wall of said caprespectively, a member frictionally engaging the said gage bar disposedin said cap above said washer, a piston for said tubular member adaptedto engage said gage bar to project the same in one direction, a springinterposed between said1 piston and said washer, and means mounted onthe other end of said tubular-member for connecting the same with asource of fluid under pressure, said piston adapted, when .moved againstthe action of said spring, to

project said bar, the latter held in its projected position by saidmember frictionally engaging the same and adapted to be manuallyretracted after the piston hasreturned to its normal position.

3. A tire age comprising a tubular member, -a cap for one end of thesame having a slot in its head and having an annular internally threadedange engaging external threads on said member, a washer provided with -aslot interposed between the end of said tube and the shoulder at thebase of said iange, a gage bar passing through said slots in sai-dwasher and Said end wall of said cap respectively, a rubber gasketdisposed in said cap'between said washer and the end wall thereof andfrictionally engaging said gage bar to hold the same againstlongitudinal movement relativel to said tubular member, Ia piston forsaid tubular member adapted to engage Said bar to pr'o'- ject the samein Onedirection, a spring interposed between said pi'ston andsaidwasher,

and means mounted on the other end of said i gasket adapted to hold saidbar in the posi- Lacasse.r 4

' tion to which it is projected by 'said piston,l

Vbar indicator element separate from said pressure-responsive element,and adapted to be pressed through said casing by saidpressure-responsive element, and a piece of rubber fxed'on the casingadapted t0 contact with said-bar for retaining said bar in indicatingposition.

.5. A pressure' gage for tires, comprising a casing, apressure-responsive element within said .c'asing, and a iatbar indicatorelement separate from said pressure-responsive element, adapted to bepressed. through said casing by said pressure-responsive element, andmeans upon'said casing for fretaining said indicator bar in indicatingposition.

6. A pressure gage for tires, comprising a casing, a coupling memberadapted t0 fit upon. an end of said casing, a deiating pin having aflange thereon, s-ald coupling member having a fiange 15 on the interiorthereof, said flange 15 having a shoulder adapted to coperate with saidflange on the delatngpin to prevent outward escape of said pin, saidcoupling pin being put in place through the inner end of said coupling.

7. pressure gage for tires, comprising a casing having a deflating` pinat `one end, said deiating pin having a saw-cut 2O lengthwise thereof,said saw-cut constituting the passage through which air may pass fromthe exterior to the interior of the gage.

ltirely from said casing.

8. A pressure gage for tires, comprising a casing, a coupling memberadapted to fit upon an end of said casing, a detlating pin having aflange thereon, said coupling member having a shoulder adapted tocoperate with said flange yto prevent outward escape of said pin, saidcoupling pin being put in place through the inner end of said cowpling,

and said delating pin having an air-passage therethrough formed by asaw-cut 20 lengthwise thereof. Y

9. A pressure gage for tires, comprising a casing, a pressure-responsivepiston therein, a coil spring pressing upon the upper side of saidpiston, an indicator element. scparate from said piston adapted to bepressed lthrough said casing by said piston for indi` eatin-g pressures,said indicator element being adapted to project within said coil spring,and said piston having a short projection within said coil springadapted to contact with said indicator element. s

10. A pressure gage for tires, comprising a casing, apressure-responsive.piston therein, a coil spring pressing upon theupper side -,of said piston, an indicator element separate from saidpiston adapted to be pressed through said casing by said piston forindicating pressures, said indicator element 4being adapted to projspring, said'indicator element having means thereon for preventing itfrom passing en- In testimony whereof I have si nedfmyA name in presenceof two subscribing witnesses.

ERICH EDELMANN.

Witnesses v M. BoYLn, JACOB M. WEILER.

ect within said coil

